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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81d83d590a2bd73587b354a2c3e50490cb830499fc519bea04cbda5ff4e8e082' 
  AND token = 'rdc3cgYRadlG+gPq3BjxMg/8CioFOAwl9SzaA7JPaIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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