SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fbf514bc9662f49c47fb2681fce3a627e42f8dacfac95a8df32571c7ec0c97a' 
  AND token = '+WaQmw9TuHblzBhfVycQF8eO/T1jqgc3uKaXsVan0z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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