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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de917557bed6d248743b60c074d6510bb9e304bd381ba6a8cf12d10f4ab3ef6a' 
  AND token = '8pPd2mf5MGArBlDezq7lu1agNCUQ6qR9ER7/PDnL3HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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