SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02cdcff11128f138d0c28bbdd7998ff459dab496dbd33dad14c7ba2fd2979b96' 
  AND token = 'yBhuZGnpQq9kw0CMBgiEStAMMOw5zWK+SiA++Gu+bBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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