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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '966aa8bab7caeec1aaad8589b9695c337d273e424e0250b6c60abd6de110b9b7' 
  AND token = '2PCi8BIszaT+x78mhh5lAgoogNLpkSqQ64Yo3k9FdlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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