Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c3d22f505f8f432c74a9c4c84e3b9b70b7a6c5feb7c7807491a3f4e19221d29' 
  AND token = 'rPUXMM37rny+NSTGhMDfpYahfBpEhBQ+oC72aKLLK8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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