SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80e83ce468b085724b176eb2b23b8990b26c3f5cc57565842523133761d7c135' 
  AND token = 'URsgmoaH6OubFmpBMA2X3xOw/j14IqsQO4ufGUztfN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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