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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bf1ffe4f573dcbef3704638ba94609d686d5d42586e16a54c5dff51ff7e0723' 
  AND token = 'A55Upb+uNUj/t2FxxGMQk3ROtzykz8LWTXCRjOtar8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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