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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc7816d686367fc3c821e8437e864a46c6cfed4aec5f26b81bbcadfbab16d6af' 
  AND token = 'bq8TVz/tdTEkp6QvCFIBfvs/7+JSni3bb5kxfsJia8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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