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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4670cd57b9de40f42ac02b649c1b4d265787ba73a9334c982ab68837a294c2eb' 
  AND token = '6DCeHMgXPIgTHTBmuXu3IQdaIW061PTnFJiG/7aUVmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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