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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec64197e8a9abbd40f716b2320a9c06ad05f2cd6be3f2c7407cd320ff6141cdb' 
  AND token = 'dYZoNTNSUrGeLqVCoRG9YtlbmrkYUxfz1lgBzIAqrpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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