SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '030d1ca86be67f7481671cfcc6d7979af72ab4332530c58d2c5bd7478cd60eb4' 
  AND token = 'SzZJXVZAR+vFAogchxDTQjM8gjJp8LriG3zXxKebdlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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