SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdf186c24277e8d2ef38f92f177e19c75717c908f45491a298a8b487bf80096d' 
  AND token = 'jQ9d6q4jSNo+KiLviWjzqX7+JxREbkdbuX68RUwK9Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00149

JSON explain

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