Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a5f320fb2bf09c5503cd4c98a06394b4d66430b83271d3a3e7283f1241399fd' 
  AND token = '4RNuvsLUZVHUDZXhaTMjspUy9aitc349MDpWEtx1uEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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