SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8da7561ad401e01b48cb09eb2c06f271b9bd7db7863026c8757836205c320d33' 
  AND token = 'ZsJUOXj7wnEz6lh7UHWjM3hZdrbgFsqmZa3mDC94450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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