SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a30c82bec515485dc3957e32c835f4d2305c5ee086ef7ab54be900aa0fa1d3f0' 
  AND token = 'aS46ULqw64nAWHvt6tYXjXZs9zw5ikFKS5mKxU2kVZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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