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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d26ba2d7eda65245ba9d5b1f8c75fe97175c9170d2a842453b2340428dd96f0' 
  AND token = 'ukcS4LvTpApC4tIgrcbRxE+71F5zDEWTNcGVormDPlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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