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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '099a693f386f35762f5e8a2ba15d5e3fe5eed9225f468d176fb8997559e439e3' 
  AND token = 'S7shi+61QCdnFeGMlp1MrCsqoU+aWfUsCUnKuSyIN8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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