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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1005100e5d8c566cef132657817cb75559d88ad3b8e1fea197d01775123815f' 
  AND token = 'A2TxRy5AMkK9aj5VfVH0ScA0ctkSEozfoShfHK6luFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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