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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea007f5664261a4c9deeddd71bf2590907e93e54779c0dbb9a2ebedcdfc89d94' 
  AND token = 'l/HcSbDNDnGzJlvW4WdRZJj/qLtcbv4kCkcMg2DBxiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}