SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e025f04a72d31b37d52ec229cc6a6b78219e8ccfa8824e5e19dea9050729da53' 
  AND token = 'hPdTGAzqn1HgqJPgyizpKXtRWy9OB5chYjxL1dK+284=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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