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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f172a81d4dfb3225f7d200b6fe0a53804c2d91263226d9f11bbe5c0f221f8cc9' 
  AND token = 'BWpaG6S3G0/eJSiRX8j6XX/K5JPSLpciJJB9Jsuf2gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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