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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef5cb3c8f50e30a286a3c353c6dddaeac740cf6ea517e78c94652686cb0c856a' 
  AND token = 'ojv0XxO+XGA70h4P41MZxUTHo54OoBKILnjHWQe8VGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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