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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07953ac094263365559465bf3c7e5bcc1abe71a4ffb0ecd11720f131de947000' 
  AND token = '3nNLh4ftfKekub3Vjsdnb7oujb3GMMA3OPQv0nQ8pjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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