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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f585673c87a10136bb2ed53431dd2bebc9eee25c3038bbbb6d4cc0d2f4020357' 
  AND token = '3OkqajYQ12H4Qou1Y9PoBZeeHVAXEa0Kl7K5Vu4xsiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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