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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b5305ce899f7001231e5713eb5610988d7cc74a3434f08ad8fd6cc527a13ed4' 
  AND token = 'seDirWd9acLccSH55LvNq7VYmCCaXHRwiBzXmClOfAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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