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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7e6e9862b50fa314847543c953e8af954dbbdfb3fb398e435845df30b540334' 
  AND token = '1evoElnjLZbphujceO/WlTx5hvPlgx0OBplTcCobyeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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