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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94ed2caad18ec5e30453e1c90a3f729241c364403d428d515352434c2a7d7318' 
  AND token = '26rg6DQJLdIgX57aS9IavrNUHE5W0RQtR7j05rMBKBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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