SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4238508d23fb4cc60fbd1a9a344b026753105447c394d01da13d8d558965e09' 
  AND token = 'qZJC0GyzjwJPwyJLXzMOqFqxmLsu/AoFKGOSXnrsO1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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