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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b199f4262239d800cca8a65d114b6415b334aa379f3c5944294922043a8f1cf4' 
  AND token = 'AZsjGEx1x1dXUQI9fI8uOM3qEchKBtJytcUBAO8mgY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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