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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db34b1270d493b367ac9022e5c0ff28d040f42ef5e1e01e5655d4ccca6fc3572' 
  AND token = 'vtJnZu0mcGmSdSHQdzWtM7eZFna3JQ6fn7eoYE6kt3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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