SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d9a21bf6f0f450781383803a6c090e559630fada5badc2164721c53cfcd0ac0' 
  AND token = 'k8ZVd4vsNuREi3U5/Q5LFil0Zm+/wJqbxuUd2JBzYwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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