SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9933b6c02e7b75c1558bf5fe8311b6139764a2419eacdfb4489bab8df1aadcc8' 
  AND token = 'xRJfMmT9Yv6O0mv6fKcuXDG61n8LjRWZjuNtYjBKJtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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