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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2565dc14e2e1fd99b3b75ff9918f21f4304a509994ca911ec7ca8b9455a4a40' 
  AND token = 'vsu9j9UJChyinzHVsCxKGnZ18RXy8ijfHcsfgOJ8eHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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