Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b81e03a5f2c853943c781958d6059261eaa6c23eadfcf4abf28a1eb0627a88cf' 
  AND token = '0yGJ8c8EolL7b+cjWY4+Lti2ebJAZyHaUdFwEoCV0b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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