SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9846aaa22097bea39b3245b19894e1d4c3c9c17cb533550efc619c922a65e419' 
  AND token = 'Pxznf21BU+3dE86OhmPJyjhGRuHIYNcknqgVbM2r3RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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