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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8e73cd9294c9c483c57e723625808e07d4f6bd668a6ade360b5ba26f976e9d1' 
  AND token = 'XMkTUckLfKJu3R+1ToWM4driVmq7HKCeTMg+Pb7KYtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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