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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '804476f3a26252a9b138eff52f0d7fbbe7ba14fd6c118f76ab61b42b7bffd0a3' 
  AND token = '3KqKpMUKFsPQM8X5f455nxaLllVSLMOmaTpKvV2pO1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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