SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20f73e20e7c6c811bda1da3ce735c20e285af03b868aed9c1fd8617c36da34df' 
  AND token = 'M7lJtkOjBZGdrspJYlfjC08v1C5VwhGOxLKJI/AMiK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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