SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '505768225a4598c8dde04da62d45ec75bb74ff7c2af920211eca14f69b9b0b60' 
  AND token = 'KS4L1hojudJ+5i5JvgrGfCeK/ZhjpLOnonxEsXl+wnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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