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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '197c004383588609bf12108bc97d2a4d28b56e2fa6bc963cb2c6a84048693a12' 
  AND token = 'xI9DaimYuTljECQHkK348xQj7BzsJznC8e9735WbHxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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