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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a50fd7d4df77cb7161a0b2d9417d9c604b811826a01f6616a89ab4ffab10d54' 
  AND token = 'os+7ydvIl0ZVxiNVdVUG7q92hnwUH5DiF6DmHU3JHwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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