SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a372a9524e1970e9e23328b136e418f94c94be59cb54571c29ea8b1581c362c2' 
  AND token = 'c+xVswYqhKaNUk71A/gcS+KT/As9SrbZpzdxLfZ+U+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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