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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '347c61b0d6b40290a0cb1da9bbd8483205c57505f8ce8b1a664402ca0e26707a' 
  AND token = '6IfRuXb75d+kCwqKNMFR3pTtOkVvtkyzwPsvSiYvDzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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