SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b799d08d994926252f6eb8053ce8c332524c6e39294b2b95c5fc8466b56e069b' 
  AND token = 'Fj5k80U9nYEDW2F+qVeSmUjBCWZ1mGXGvS0G1KoTY9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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