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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a4ecdb14ae6ac2c5c1b232ad45fa66a2aff00e266e864b7c27425b00875c668' 
  AND token = 'exRhje9+YSf5V+uA8+lo5ZqL+az1+6U2gpb6OkzNEck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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