SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd469bef4e9ee1d401a7315fe36afb81cdfca314b22b055b6d091f577571cfc84' 
  AND token = 'IXVR+zku9hacQv3DWmDsmsgFNlxPb1FPw30AeohnB5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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