SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a3ff3ac5f85a1e4f7fab611bca1185925d256d2d00c86792ceaa7847e8483f5' 
  AND token = 'VW4yjkpvLRBuLPrgp9onHv9ZhGrHukinh3Mi+HaTcAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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