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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d0128b86a57ca797c485c11cb466ab91d1a97c411225472567877086605d9ff' 
  AND token = 'o8vUsDjx9i+Cp/48drSaZqYjN5W4QJ8wqiByCtHtpAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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