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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8935d9f83792cdc07e2f83a210583f4b56d069a6620d565becf1b35c6fe5c71c' 
  AND token = '2Bm+wwe2iHrhva89K6d7pzv4anOS3wDatAIMQfGnhWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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