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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afcd6e1a73b02c78836407fced74cd01207ebebeb3fb3df9a3cc13742d694cc7' 
  AND token = 'F63f4vt/l8zejc7IKhMhIO3TmrgZcBDQqFUA2/iuiDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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