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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a37960ff8befb64200c414444489f18a67007f63f417fef041f8939374f9258' 
  AND token = 'vmqRSGbUYB7tRMJGixSbk1hE38dE0gt9C0KePg7kwDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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