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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b6cb55ac07092727ee8c69bfc4118dfbfba3a275ba6295a03f24e04ac302913' 
  AND token = 'xnNtUxPrxiS9QwHsXNmNQcr8VcO/f+VRqtwaVPEXkMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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