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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '692504a108efc98ad9d0baa8caac750f1f894739715ec6e6d86ceb406761e6cb' 
  AND token = '9DPwMqzsESxqvBmrv42jErcncYsecnyp0DVSdWN6wl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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