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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e2fafcf0e2fe0b1408a2fa2e9efd4529917be0f63d9db0dca7d5e1ecd466e12' 
  AND token = '5BmUYcmLdaeU/6nHIj6Oi9Y1aVjTQUjWUWGwckzNbH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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