SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93ea6275c59e910afa9e485f7eb2b210807b967213284719c106e9dd4c9369c5' 
  AND token = 'l3FMD9YDf8wkd8HBB0z4RS1qWAQhkVVg5hS+T1DlfGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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