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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f1ee282ae415e93c84d2ff6d74c3a9b00f42e74fcab548c27e410b52c588bd5' 
  AND token = '0yZaFpQLJHMQmMD7xBZnxBUwQs1To6EPKhP4yWXWPo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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