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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f2702433be47631c427f8c54bd4455e5bbeae1a4467be1ec35fa243fd9d64f4' 
  AND token = '7jZkby4l6dx0Cq9pfZl6PgeyPcQlwP56Er2aCJXz/Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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