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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '591467d0f9b9c3f2fa39e6b05dea00f3c29354064adb306c54e66ac7ec696155' 
  AND token = 'RVcsOASCDLnr9h6ZpaG0OcgEdB/yqrnT6nO+Yhj5DLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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