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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cf69be3624f98e6e9dd9e13436d5b6e71beaf374c06e9c548c7af9168efe3af' 
  AND token = 'zDK+5Nn9ltIMQgADmTcmaMJh0oMFGC0TOtnwMrahLio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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