SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50c905fcf89e5b28a08ce0373b6beaf6bab275bb83f46d47dbd0647634c4f52e' 
  AND token = '5yvNrnTfZdUlBqblzNf8stuM4OjujOQ6CGnwvqLpFY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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