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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0078170ffb12a29e8c8fcda66eb948578f01516aa550b59354e86cff5e4da271' 
  AND token = 'pIFGvqscjJKS5SDIAuDbX/8SZzXenySeA2GxAt0GYKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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