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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ccaa2d329db7ae60ad764710013d316ff8e0a766db04934634e895e91dd7df7' 
  AND token = 'HG4DZptMARr9lIS/ARNtZLVkm1WjUcey6vEZFf5NFWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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