Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99bcca10788db8de47eb3f90d21c3e90ddc6b84a4690789a60c4083978d454c5' 
  AND token = 'pCCiLRQ3EDs08ArUKtS5BGmEm9MkQHIf+PWpIYvt4fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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