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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d33e6d9715dea603799d89bc5bb2dd901bb2d64c5a883c902a9a4c31188e014' 
  AND token = '9vQlkhBjFrmVnOLYHoAMJqIxcm5OvIDcW3HHAHr8KUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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