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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ea3ab3664b20356ca998990f9c27e086dc881c85f23ac06dd92b0fc7eccb4e5' 
  AND token = '23UbXXWFaG1vsNssUTMDu6tWpZ6aHdoPevev+7vExkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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