Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51028694a08c5174eff17d8694d825a5cc37156d663c15ba98cbadb821f72d8c' 
  AND token = 'udR1VBhjYDbRh1jkS8fx16zs/aAyMOsRNwzxMGzmdmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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