SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '882d917f08f74a15078d30b72d4089fd62620b8cf73e5b72030cd13eabed7da0' 
  AND token = 'lnmFLHFAgp1U4rkuoUGV9Bm8ml/+g7GWeXgGQlxujIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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