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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c62d8e99b00bba0e44f72df806ba61f7fd3df6f6cdd99e256b08d07e3e4b9cc6' 
  AND token = '19aZPMayb5p8MVh2s07jCzd+nYJP3gsBal23veGC2Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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